Comparison of intracranial pressure elevations of different levels and durations in the different groups of patients
| Level of ICP elevations | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 mm Hg | 25 mm Hg | 30 mm Hg | 35 mm Hg | |||||||||
| Duration of ICP elevations | Management groups | N (%) | Median (range) | N (%) | Median (range) | N (%) | Median (range) | N (%) | Median (range) | |||
| Percentages of cases within each group presented in parentheses. Numbers of ICP elevations during a standardised recording time of 10 hours presented as median numbers with ranges in parentheses. *p < 0.05; †p < 0.01; ‡p < 0.005; §p < 0.001 (Mann–Whitney test). ICP, intracranial pressure. Group 1, “normal” mean ICP; group 2, “low” mean ICP; group 3, “high” mean ICP. | ||||||||||||
| Sleep state | ||||||||||||
| 0.5 min | Group 1 | 33 (72) | 22 (1 to 121) | 27 (59) | 7 (1 to 64) | 20 (43) | 5 (1 to 50) | 14 (30) | 2 (1 to 22) | |||
| Group 2 | 5 (36) | 2 (1 to 25) | 2 (14) | 4 (2 to 5) | 2 (14) | 1 (1 to 2) | 1 | 2 (2 to 2) | ||||
| Group 3 | 9 (100) | 186 (15 to 765)‡ | 8 (89) | 107 (1 to 233)* | 8 (89) | 43 (1 to 100)* | 6 (67) | 15 (3 to 58) | ||||
| 1 min | Group 1 | 30 (65) | 15 (1 to 79) | 22 (48) | 6 (1 to 36) | 17 (37) | 3 (1 to 25) | 9 (20) | 2 (1 to 13) | |||
| Group 2 | 3 (21) | 4 (1 to 15) | 1 | 3 (3 to 3) | 1 | 2 (2 to 2) | 1 | 2 (2 to 2) | ||||
| Group 3 | 9 (100) | 86 (2 to 560)* | 8 (89) | 55 (1 to 148)* | 7 (78) | 26 (1 to 51) | 6 (67) | 5 (1 to 30) | ||||
| Awake state | ||||||||||||
| 0.5 min | Group 1 | 30 (65) | 10 (1 to 166) | 21 (46) | 8 (1 to 92) | 12 (26) | 9 (2 to 42) | 12 (26) | 4 (2 to 9) | |||
| Group 2 | 5 (36) | 5 (2 to 58) | 3 (21) | 3 (3 to 40) | 3 (21) | 3 (1 to 27) | 1 | 6 (6 to 6) | ||||
| Group 3 | 9 (100) | 232 (20 to 684)§ | 9 (100) | 57 (5 to 296)† | 6 (67) | 26 (2 to 63) | 4 (44) | 10 (6 to 18) | ||||
| 1 min | Group 1 | 22 (48) | 10 (1 to 107) | 13 (28) | 7 (1 to 55) | 10 (22) | 3 (2 to 18) | 8 (17) | 2 (1 to 5) | |||
| Group 2 | 3 (21) | 10 (1 to 33) | 2 (14) | 10 (1 to 19) | 1 | 10 (10 to 10) | 1 | 4 (4 to 4) | ||||
| Group 3 | 9 (100) | 140 (12 to 422)§ | 9 (100) | 27 (2 to 174) | 5 (56) | 13 (8 to 37) | 4 (44) | 6 (3 to 18) | ||||